Pathology of Skin Lesions Associated with Marek's Disease of Chickens

Abstract

The skin was examined pathologically in 18 field cases and 1 experimental case of Marek's disease of chickens. Grossly visible skin tumors were detected in 6 cases (31.6%). Only two of these 6 birds had more than 10 skin tumors, whereas the other four had 1 to 10 tumors. In cutaneous sections, neoplastic lymphoid aggregates were observed in 11 cases (37.9%). Most of them were present adjacent to feather follicles. They frequently coalesced and ex